Piezo-electric-crystal mounting



C. F. RUDOLPH PIEZO ELECTRIC CRYSTAL MOUNTING Nov. 15, 1927.

Filed Oct. 21- 1925 sEc-rioN A-A 1110: neg

Patented I Nov. 15, 1927.

COBRIE I. RUDOLPH, OF WASHINGTON, DISTRICT OF COLUMBIA.

?IEZOEIiECTRIC-CRYSTA L MOUNTING.

Application filed October 21, 1925. Serial No. 63,946.

My invention relates broadly to apparatus usingpiezo electric crystals and more particularly to a crystal holder for use in such apparatus.

The object of my invention is to provide a holder whereinthe crystal is protected from variable atmospheric conditions. Another obj ectv of my invention is to provide. a holder for a plurality of crystals permitting ready change from one crystal to another. A further object of my invention is to provide a' holder readily interchangeable with other holders whereby one set of crystals may be quickly substituted for another.

These andother objects are secured by supporting a plurality of crystals on a common base so constructed as to fit in a standard socket for vacuum tubes whereby the connections of the socket are used for establishing circuits through the crystals. The tube, enclosing the crystals, ma containrarified air or any desired gas un er any desired pressureor vacuum. The crystals are thereby protected from atmospheric conditions.

Reference is to be had to the accompanying drawing forming a part of this specification in which Fig. 1 is an elevation of an embodiment of my invention.

Fig. 2 is a view of a lead-in wire, and FFig. 3' is a section on the line A-A of The crystals 1 are supported on plates 2 having arms 3 bent about the crystals to limit their movement. The plates are carried by a frame 4, that forms a commonreturn for the crystal to the wire 5 secured to the frame. Lead-1n wires 6, 7, 8, one for eachcrystal, provide connections to the respective crystals and are fitted. with projecting lugs 9, 10, 11, that fit into holes formed in contact plates 12, 13 and 14: respectively resting upon thecrys tals, thereby holding the plates from movement. The lugs do not touch the crystals. Light springs 15, 16 and 17 insure contact between, the lead-in Wires 6, 7 and 8 and the 2 plates 12, 13 and 14. Pigtail connections may be used in place of the springs if desired.

The lead-in wires and the frame tare supported from an insulating member '18 enclosed and sealed in a tube 19-. The member 18 and tube 19 are secured to a base 20, constructed similar to a vacuum tube base, with I projecting pins 21 and socket engaging pin 22 adapted to fit the standard tube socket.

of crystals quickly substituted for another set. This ease of change in substitution is of particular advantage in circuits wherein a crystalis used to control the frequency of oscillation. With the enclosure of the crystals in a sealed tube, the crystals are protected from any change in atmospheric conditions, such as moisture etc. I

It will be understood that the above description and accompanying drawingscomprehend only the general and preferred embodiment of my invention and that various minor details in construction and arrangement of parts may be made Within-the scope of the appended claims and without sacrificing any of the advantages of my invention.

Having thus described my invention what I claim is:

1. In a crystal holder, a base, pins projecting from said base for engagement with contacts of a standard vacuum tube socket, a

crystal supported on said base, connections from said pins to said crystal for establishing a circuit, and a tube enclosing said crystal and sealed upon said. base.

2. In a multiple crystal holder, a base, a a

frame secured to said base,"plates carried by said frame for "supporting crystals, said plates and said frame forming a common return for said crystals, and individual le d'-in gontacts for said crystals mounted o the ase.

3. In a or stal holder, a plate for supporting a crysta a second plate making a second contact with the crystal, 'a lug projecting within an opening in said .second plate, meanssupporting said lug and means insuring electrical contact between said lug supporting means, and said second late.

4. In a crystal holder, a plate or supporting a crystal, a second plate making contact with the crystal, at lug projecting within an opening in said second plate to prevent displacement of the plate, and means supporting said lug.

5. In a piezo electric crystal holder, a base, pins projecting from the base for engage ment with contacts ofa socket, a piezo electric crystal supported upon the base, connections from the plus to the crystal for establishin a circuit and a'tube enclosing the standard, contact lates, one plate snipportr 10 crysta and mounted upon the base. ing a crystal and ed upon the stan ard, a 6. In a piezo electric crystal mounting, a second standard and means attached thereto standard, contact lates, one plate supportfor resiliently holding another of the plates ing a crystal and ed upon the standard, a in cont-act with the crystal, the standards second standard and means attached thereto serving as electrical connectors leading to l for resiliently holding another of the plates the contact plates. in contact with the crystal.

7. In a piezp electric crystal mounting, a CORBIE F. RUDOLPH. 

